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astraxan [27]
3 years ago
5

8- Which of the following statements about a catalyst is true?"

Chemistry
1 answer:
Minchanka [31]3 years ago
8 0

Answer:

B) A catalyst can accelerate a reaction.

Explanation:

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If the density of ethanol, C2H5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 15.0 g of CO2 according
Svetradugi [14.3K]

Answer:

9.94 mL, the volume of ethanol needed

Explanation:

The reaction is:

C₂H₅OH(l) + 3 O₂(g) → 2 CO₂(g) + 3 H₂O(l)

We convert the mass of the formed product to moles:

15 g . 1mol / 44g = 0.341 moles

2 moles of dioxide are produced by 1 mol of ethanol, in order to stoichiometry.

Therefore, 0.341 moles of CO₂ must be produced by (0.341. 1) / 2 = 0.1705 moles of alcohol.

We convert the moles to mass, and then, the mass to volume by the use of density.

0.1705 mol . 46 g / 1 mol = 7.84 g of ethanol

Ethanol density = Ethanol mass /Ethanol volume

Ethanol volume = Ethanol mass /Ethanol density → 7.84 g /0.789 g/mL =

9.94 mL

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3 years ago
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A home is heated by a system that uses sunlight to warm water in pipes. Which statement best describes this system?
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Answer:

In which part of a nuclear power plant does fission take place? A home is heated by a system that uses sunlight to warm water in pipes. Which statement best describes this system? An active solar system because sunlight shines on the pipes naturally.

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Cual es la contribucion importante de los alquimistas
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Answer:

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Explanation:

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Which transformation represents light energy transforming into chemical energy?
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